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N/A rotary engines are designed to run on lower octane gasoline, generally the lower the better, saves you money, and some people see better perfomance running lower octane gas in their N/A. Higher octane gas may not completely combust, leaving residue or creating problems with carbon buildup.
The opposite is true for turbo cars, because of the higher pressure in a turbo engine, you want to run as high as possible octane, to help prevent predetenation, damaging your engine.
I dont make much sense, someone else could do a better job clearing this up, but the rule of thumb i go by is, turbo needs high octane while N/A uses low octane.
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